Beagle in severe pain, lethargic, can hardly walk

My 3 year old Beagle is suddenly barely able to walk.  I went to a concert Sunday afternoon.  Before I left the dog was fine.  When I got home at 10 pm the dog could barely walk. She was unable to make it down the stairs so I carried her. She was obviously in pain, and lethargic - completely unlike herself - but was still eating, drinking and went to the bathroom.  Took her to the vet Monday morning. She wasn't acting as bad at the vet as she was at home - I think maybe adrenaline was pumping because she was at the vet. They did the ortho exam and she didn't yelp once.  There was no sign of spinal/skeletal damage based on the physical exam. They did not do an x-ray. Blood work came back "great". Now it is Tuesday night and she seems worse.  She is still eating and drinking, but when I carry her out to go potty, she just lays down and will no longer attempt to stand up. She seems to be more sensitive when moved. She did walk around a little this afternoon and go potty on her own, but now she won't. She is on pain meds prescribed by the vet, but that does not seem to be helping. Has anyone come across this?  I am going to take her for a second opinion tomorrow and insist on an x-ray, but anyone knows of something I else I should be looking out for, I would really like to know.  I read about Beagle Pain Syndrome, but her blood work was "great" according to the vet so I don't know if that is something to worry about.  Again, any advice/help is greatly appreciated. Thanks!

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